79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include <atomic>
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#include "BLI_function_ref.hh"
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#include "BLI_map.hh"
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#include "BLI_vector.hh"
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namespace blender::ed::spreadsheet {
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/**
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* A generic cache for the spreadsheet. Different data sources can cache custom data using custom
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* keys.
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*
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* Elements are removed from the cache when they are not used during a redraw.
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*/
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class SpreadsheetCache {
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public:
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class Key {
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public:
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virtual ~Key() = default;
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mutable bool is_used = false;
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virtual uint64_t hash() const = 0;
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friend bool operator==(const Key &a, const Key &b)
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{
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return a.is_equal_to(b);
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}
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private:
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virtual bool is_equal_to(const Key &other) const = 0;
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};
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class Value {
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public:
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virtual ~Value() = default;
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};
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private:
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Vector<std::unique_ptr<Key>> keys_;
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Map<std::reference_wrapper<const Key>, std::unique_ptr<Value>> cache_map_;
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public:
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/* Adding or looking up a key tags it as being used, so that it won't be removed. */
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void add(std::unique_ptr<Key> key, std::unique_ptr<Value> value);
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Value *lookup(const Key &key);
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Value &lookup_or_add(std::unique_ptr<Key> key,
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FunctionRef<std::unique_ptr<Value>()> create_value);
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void set_all_unused();
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void remove_all_unused();
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template<typename T> T &lookup_or_add(std::unique_ptr<Key> key)
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{
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return dynamic_cast<T &>(
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this->lookup_or_add(std::move(key), []() { return std::make_unique<T>(); }));
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}
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};
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} // namespace blender::ed::spreadsheet
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